His boss 'assured' him that he had her continued support. = His boss 'assured' him of her continued support. = “You have my continued support,” his boss 'assured' him.
You can 'rest assured' [=you can be sure] that these mistakes won't happen again. = 'Rest assured', these mistakes won't happen again.
They are not 'assured of' being paid. [=it is not certain that they will be paid]
(..) But not to talk about nothing. - I'll fuck that asshole. - Shut off your cell. My little Nicolas it's true I got a bit carried away. Rest assured. I have nothing against you. I'll be going now. I already told you. Still want the UMP. I'll leave you the UMP. (..)2016 Me Before You